Bitmap not drawn anti-aliased

Question

I have a custom View that always draws a Bitmap at a certain rotation. I overwrite the onDraw method, rotate the Canvas a

Answer 1

I tested the previous suggestions and they do work for me. Maybe the issues is in your bitmap ? Maybe in your device? Here is a code that creates the bitmap inline. Check if this example works for you.

public class BitmapRotateActivity extends Activity { 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new MyView(this));
  }
  class MyView extends View {

    Bitmap bitmap;
    public MyView(Context context) {
      super(context);

      bitmap = Bitmap.createBitmap(160, 160, Bitmap.Config.RGB_565);
      Paint p = new Paint();
      p.setColor(Color.RED);
      p.setStyle(Paint.Style.FILL);
      Canvas c = new Canvas(bitmap);
      c.drawRect(0, 0, bitmap.getWidth(), bitmap.getHeight(), p);
    }

    @Override
    protected void onDraw(Canvas canvas) {
      Paint pbg = new Paint();
      pbg.setStyle(Paint.Style.FILL);
      pbg.setColor(0xffe0e0ff);
      canvas.drawRect(0, 0, getWidth(), getHeight(), pbg);

      Paint p = new Paint();
      p.setAntiAlias(true);
      p.setFilterBitmap(true);

      canvas.save();
      canvas.rotate(3F, getWidth() / 2, getHeight() / 2);
      canvas.drawBitmap(bitmap, 30, 30, p);
      canvas.restore();
    }
  }
}